Internationally-renowned photojournalist Gerd Ludwig has spent years documenting the aftermath of the Chernobyl nuclear disaster. In 1986, an error at the plant in Ukraine led to an explosion that ultimately caused over a quarter of a million people to permanently evacuate to escape the radiation and radioactive fallout. Over the course of several trips to the site and the region, Ludwig has amassed a documentary record of a people and a place irreparably altered by a tragic accident. Now Ludwig has released an iPad app with over 150 photographs, video, and interactive panoramas. Gathered here is a small selection of the work Ludwig has produced over the years of the still-unfolding tragedy. -- Lane Turner (23 photos total)On April 26, 1986, operators in this control room of reactor No. 4 at the Chernobyl Nuclear Power Plant committed a fatal series of errors during a safety test, triggering a reactor meltdown that resulted in the world's largest nuclear accident to date. Today, the control room sits abandoned and deadly radioactive. Chernobyl Nuclear Power Plant, Ukraine, 2005 (Gerd Ludwig/INSTITUTE)